package com.hmdp.utils;

import com.sun.org.apache.xpath.internal.operations.Bool;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.DefaultTypedTuple;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Component;

import java.util.Collections;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
//实现分布式锁
public class SimpleRedisLock implements  ILock{
    private String name;
    private StringRedisTemplate stringRedisTemplate;
    public SimpleRedisLock(String name,StringRedisTemplate stringRedisTemplate){
        this.name=name;
        this.stringRedisTemplate=stringRedisTemplate;
    }
    private final static String KEY_PREFIX="lock:";
    private final static String ID_PREFIX= UUID.randomUUID().toString()+"-";
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;
    static {
        UNLOCK_SCRIPT=new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }
    @Override
    public boolean tryLock(long timeoutSec) {
        //获取线程标识
        String threadId =ID_PREFIX+Thread.currentThread().getId()+"";
        Boolean flag = stringRedisTemplate.opsForValue().setIfAbsent(KEY_PREFIX + name, threadId + "", timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(flag);
    }
    @Override
    public void unLock() {
        //调用lua脚本
        stringRedisTemplate.execute(UNLOCK_SCRIPT, Collections.singletonList(KEY_PREFIX+name), ID_PREFIX+Thread.currentThread().getId());
    }
//    @Override
//    public void unLock() {
//        //判断锁的标识是否一致
//        String threadId =ID_PREFIX+Thread.currentThread().getId();
//        String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);
//        if(threadId.equals(id)){
//            stringRedisTemplate.delete(KEY_PREFIX + name);
//        }
//    }
}
